04 Feb '12, 7am

[selected by Rael] A Double-Duty Solar Solution: How to Build a Solar Water Heater

[selected by Rael] A Double-Duty Solar Solution: How to Build a Solar Water Heater

The system takes water from near the bottom of a solar heat storage tank and pumps it through a collector — where it’s heated by the sun — and then back to the tank. This continues as long as there’s sun on the collector. An off-the-shelf controller monitors the temperatures of the collector and the tank, and it turns the pump on only if the collector is hotter than the tank. When the pump is off, water drains from the collector back to the tank. This type of “drainback” system is especially useful in cold climates because it keeps the water from freezing inside the collectors.

Full article: http://www.motherearthnews.com/do-it-yourself/solar-water...

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